I actually don't know what you're talking about.
The whole lootboxes thing has been in high focus for the past decade, but you're the first gamer who doesn't know what are people talking about and it's just cosmetics? I'm sorry, WHAT?
This is incredibly misleading.
Please learn why they were sued and stop spreading lies like they were easily issuing refunds. Your argument suddenly starts falling apart when you learn the facts and remove the gabe-glasses.
Do you have any more info on this?
Actually, I likely don't. This comes from era of forums, constant leaks and insider info. You might be able to find more after terms like "L4D and Xbox dlc pricing"
Here is one article that touches on the topic of why this happened: https://www.xboxachievements.com/news/news-3496-l4d-1-dlc-pricing-down-to-ms-not-valve.html
Note that this was a problem for Xbox, but valve for whatever "mysterious" reason decided to do that for PC too.
Rest of your comment is basically downplaying shitty things. Yeah, no, sorry, you did not convince me yet to join this religion

He likes them undeveloped